Hi
Supratile has been sold for use by he military in Alaska with no issues. Sealing is not needed.
Depending on sun exposure you may need to use the adhesive on the first 2-4 rows of tiles,but live with it first as easy to pull up and add if needed.
Thanks for the response! I did go on your website and request a sample. Do you think the 5.5mm is sufficient? I do some car work where I will use a jack and jack stands.

